Safety device for elevators.



E. D. ENGLEDOVE 81 C. W. KITTERMAN.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION 111120 AUG. 5. 1908.

1,164,796. V Patented Dec. 21, 1915.

coLumsm PLANDGRAPH COHWASHINGTON, D. c.

' disengage the dog without shock.

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EDWY I). ENGLEDOVE AND CHARLES W. KITTERMAN, 0F WASHTNGTON, DISTRICT OFCOLUMBIA. I

SAFETY DEVICEFOR ELEVATORS.

. Specification of Letters Patent.

To all whom it may concern:

Be it known that we, EDWY D. ENGLE- nova and CHARLES W. KITTERMAN,citizens of the United States, and residents of Washington, District ofColumbia, have invented a new and useful Safety Device for Elevators, ofwhich the following is a specification.

Our invention relates to improvements in safety devices for elevators,particularly that class known as door locking devices. Its design is toprevent the now frequent and often fatal accidents to passengersattempting to enter or leave an elevator while the car is in motion.

The construction of our invention is shown in the accompanying drawings,in the different views of which similar characters refer to similarpart-s.

Figure 1 shows a form of the invention to be used when best suited tothe construction of car and shaft. Fig. 2 shows an adaptation for usewhere the space at the side of the car is limited, or Where this formbest meets the conditions as to construction of car and shaft. Theprinciple of operation of the invention is the same in either case. I

As shown in Fig. 1 a safety latch lever D is pivoted at 0? on the casingof the elevator shaft adjacent theside N of the door opening, and theinner end of this lever is connected by a link E to a locking lever Bwhich is pivoted atb to the casing and has an inwardly projecting toothb on its lower end adapted to engage a controlling member A on theelevator cage. To the outer side of the elevator cage is attached acontrolling member or guard A, which is simplya vertical bar attached tothe side of the cage in position to come in contact with the tooth ofthe dog 6 on lever B, the ends of the member A being preferably roundedso that when the elevator rises and falls the member A may engage and IThis member A has a notch A which is located therein at such a pointthat when the floor of the elevator cage is at the proper level with thefloor of the landing the dog 6 can enter the notch A. The lever B isconnected above pivot b by a link C to the upper end of a controllinglever F which is pivoted to the casing at 7 adjacent the side N of thedoor opening, and in such position that its lower end will be engaged bythe door N when the latter is closed, so that leverF will be oscillatedby the closing of the door and swing lever B so as to carry the dog I)out of the notch A in the controlling member A, and when the door N isclosed and latched and locked-as by the usual catch a engaging a keepern on the casing-the parts will be in the position indicated in fulllines in Fig. 1, so that the dog 6 is held out of'position to engage themember A. When the door N is opened the lever B is pressed into positionto engage with the member A by means of a spring S connected to theupper end of the lever B and to a fixed point on the casing as shown.The spring actuated movement of the lever may be limited by a stop 8.The door N is provided with an auxiliary catch n which when the door isclosed will be engaged by the tooth (Z of latchlever D as indicated infull lines in Fig. 1. The parts Patented Dec. 21, 1915.

are so arranged and connected that the door 1 N can be slightly startedoutward before the tooth d and catch a look. If the elevator cage shouldbe stopped either above or below the proper floor level, then the dog 7)cannot enter notch A, but will be held out of locking engagementtherewith, by member A, and therefore the'latch lever D will be held inposition to engage catch n on the door N; and consequently though theoperator may disengage the catch 72' he cannot open the door N, and theelevator cage must be shifted to the proper fioor levelso that dog I)can enter notch A before the doorN can be opened. Upon closing the doorN lever F is oscillated thereby and shifts lever B so as to disengagedog 6 from the notch A, and at the same time thro l ch le e D n a i opost tion to cause dog J to engage catch n so that the door will belocked and remain locked until the elevator cage is again stopped insuch position that the dog 6 can enter the notch A. The door N must beoperated from within the car by the operator as usual, but he cannotopen it until the cage is stopped at the right level. The car howevercan pass any, landing without affecting the safety locking devices ofthe door.

I In the construction shown in Fig. 2, the lever B is arranged at oneside of the door opening, but is connected to a bar Cfiwhich is slidablysupported on "the casing and has a lip C on its free end adapted to beengaged by a stud or pin 71. on the door N, in closing, and be therebymoved so as to rock lever B and disengage the, dog I) from notch A solong as the door is closed as in dotted lines Fig. 2. A safety latchlever D is pivoted to the casing adjacent the door opening and below barC and is connected to the bar C by a link E Said lever D has ahead dadapted to drop behind a pin n on the door N when the door is closed(see dotted lines Fig. 2), and will prevent opening of the door unlessthe elevator cage is stopped in such position (as shown in full linesFig. 2) that dog 6 can engage notch A) in the member A. The door N isshown closed in dotted lines in Fig. 2, and when the door starts to openthe pin 12 will engage head d of lever D unless tooth Z) can enter notchA. If tooth b finds notch A then lever D rises to the position shown infull lines Fig. 2 before pin 01? strikes it thus letting the door openfreely. When the door closes after pin 92 passes the head d pin nengages lip C and causes lever B todisengage member A,

' and head 0Z to drop behind pin a, the

parts operating substantially as the parts in F1g.'1.

When the car isto be stopped. at a landing, the operator must bring itsfloor prac- I tically flush with the 'floor of the building (the amountof the tolerancewill be determined by the length of the recess in thecontrolling member) so that the pawl can drop into the recess, beforethe door can be opened. The

Y pawl should be of substantial construction to resist shock, but asthere will be no great strain upon any of the other parts, they may bemade of lighter material.

A peculiar advantage 'of our invention is that itsaction is notdependent upon the thought of the elevator conductor. It works withoutreceiving any attention from him; he vsimply goes through the usualmotions required in operating the car. The door can not possibly beopened until the car has been brought to a standstill at a floorlanding; and when the car has been stopped and the door opened, it isautomaticallylocked and held until the door is again closed.

The double door system is not anabsolute safeguard against accidentthrough carelessness on the part of the elevator opera'toror 3 thepassenger. The operation of the'inn'er door is not automatic, but is deendent upon the will of the conductor. Our device works satisfactorilyon the inside doors, and if used on them absolutely prevents accidentsthecar, anda landing door; with a locking I dog pivoted on the shaftca'singadjacent said door,adevice adapted to .be actuated by the door,whereby the dog is held out of engaging position while the door 1sclosed, a safety'lever pivotedon the casing,

a link connecting said lever with the door actuated device, and a deviceon the door engaged by said safety lever whereby the door is kept lockeduntil the controlling member is properly positioned opposite the g p2.;In a safety attachment for elevator shaftrdoors, the combination of acar, a

notched controlling member moving' with the car, a landing door, alockingldo'g pivoted onthe shaft casing adjacent'said door,

a member adapted to be actuated'by. the door and whereby the dog is heldout of en gaging position while the door is closed, ,--a

safety lever, and a-device on the door engaged by saidsafetv'leverwhereby the door is kept locked until the car is properly 0 .sitionedopp0site the'door, and connections between the safety lever and thelooking I the door-locking device whereby whenv one:

is in locked position the other is in unlocked position, and means forreleasing-the said door-locking device when the shaft door is opened.

4. The combination H a notched member on the cage, a shaft door, and acatch on the door; lever in the shaft adapted to engage the notch in themember on the cage; a door-' locking lever pivoted in the shaft in"posiwith an elevator cage,

of a cage locking .tion to engagethecatch on the door-"when a the latteris closed, connections between the signed our names in the presence oftwo cage-locking lever and the said doos-locking subscribing Witnesses.

lever whereby when one is in locked posi- T tion the other is inunlocked position, and AN means for releasing the said door-locking,lever When the shaft door is opened, sub- W'itnesses: stantially asdescribed. J. M. BRoWNE,

In testimony whereof We have hereto E. M. DILLON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. G.

